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Introduce unsafe offset_from on pointers
Adds intrinsics::exact_div to take advantage of the unsafe, which reduces the implementation from ```asm sub rcx, rdx mov rax, rcx sar rax, 63 shr rax, 62 lea rax, [rax + rcx] sar rax, 2 ret ``` down to ```asm sub rcx, rdx sar rcx, 2 mov rax, rcx ret ``` (for `*const i32`)
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